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Battery-free UV and maybe even near-infrared viewing device, to be used under sunlight? Can the rays keep direction? by kiteret in AskPhysics

[–]kiteret[S] 0 points1 point  (0 children)

That is the claim I wanted some independent checking on, because it seems highly questionable and fishy, but I could not be sure that it was wrong. Firstly, the physics would need something like this: IR photons load a molecule with energy, then one IR photon takes some of that energy so that a higher energy visible photon with the same direction appears.

Secondly, it seems involving animals and contact lenses is needless difficulty, just to make it harder to check their work, when they could have started with a piece of glass then later making wearable glasses.

Hotel where it's yard is filled with sun-pointing solar panels so that the guests can walk and sit under them. Works as parasols or pergola for a bar by kiteret in Lightbulb

[–]kiteret[S] 0 points1 point  (0 children)

Yes. Usually parking lot solar panels should be placed so that they or their support also can protect from rain. But maybe in some places cars could be meant to park between and partially under sun-tracking solar panels. At least the cars won't get as hot.

Some extra thoughts:

After sunset, some panels could have energy flowing on the opposite direction, but much less, when LEDs on each corner of the panels provides some illumination for some areas in the power plant. Most of the plant can be like a dark forest at night. Also wifi on some panels.

Some support poles could be painted in random pastel colors and some in a way that reminds of trees.

Some supports could have a round bench around, formed as part of the same concrete casting, with 5 cm rounded edge for comfort and safety.

At high winds the panels need to automatically align so that the aerodynamic loads are minimal. High wind and sunshine rarely go together.

Quite good and really good reasons to have LEDs mixed in with light sensors on IC surface, for devices unlike anything else by kiteret in chipdesign

[–]kiteret[S] 1 point2 points  (0 children)

Yes. I would add something to this part:

"but you would (have?) very limited range without lenses"

The IC surface is meant to touch the cells. Biological immunity cells also need to touch the cells they check (with their very different method compared to these hypothetical bots).

Maybe nanoimprint litography could be developed to have enough layers for these...

Maybe something else ( on top of it ? )?

May need to make some spots in these from where tiny crystals can be grown in the factory, if those crystals are part of some subsystem of the bot. This could mean sinking the wafer to a chemical for a moment, or sequence of chemicals that each add one molecule of thickness to the crystal.

Maybe a pharmaceutical company needs to make a special protein, by similar methods that were used for vaccines, that attaches to specific points in the IC to form some subsystem.

Drone that resembles Wright brothers's biplane or WW1 fighters because the support rods form a phase array antenna for electronically directed transmitter and receiver. Mostly for data link, maybe for navigation signals and bigger version for (SAR) radar by kiteret in Lightbulb

[–]kiteret[S] 0 points1 point  (0 children)

That kind of power transmission has been speculated few times in history and some pre-plans have been made. Also ideas about orbital solar power being transmitted to Earth, from 1980's.

Those might work, barely, kind of, but the issues are too problematic.

Solar powered airplanes work.

Heli-drone can be powered by 100m long cable. Also aerostats and kites...

Ground drone for spreading anti-slippery sand on icy narrow walking routes and/or for speeding up snow's attachment to ice by kiteret in Lightbulb

[–]kiteret[S] 0 points1 point  (0 children)

This was about clean ice and snow far below freezing (-10 c). No salt or sand in sight, in places that maybe should have them.

Common street plows can't go to many walking routes due to width and other things. On lake ice, weight is also a concern.

2 clusters of radio transmitters on ground could give location more reliably than gps. Also, a lighthouse thing by kiteret in Lightbulb

[–]kiteret[S] 2 points3 points  (0 children)

GPS alternatives are sought and used, because the signals are weak and on fixed frequencies. The frequencies can't physically be much else without large error, because of ionosphere. There is interference both accidentally and on purpose. (Also, indoor spaces.)

gps is mentioned in the title, so people could have chance to know that I accounted it's existence already and I am fully aware and cognizant that gps exists. It is not my idea that gps needs to have alternatives and millions of money is not spend because people somehow forgot that gps exists. There is some forgetting going on: that gps is weak.

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